Dyfyniad APA

Lansing, J. B., & Morgan, J. N. (1971). Economic survey methods. Survey Research Center, University of Michigan.

Dyfyniad Arddull Chicago

Lansing, John B., and James N. Morgan. Economic Survey Methods. Ann Arbor: Survey Research Center, University of Michigan, 1971.

Dyfyniad MLA

Lansing, John B., and James N. Morgan. Economic Survey Methods. Survey Research Center, University of Michigan, 1971.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.